auth.py 文件源码

def get_flow(secret, scope, redirect):
    """
    Retrieve an authentication flow object based on the given
    configuration in the secret file name, the authentication scope,
    and a redirect URN
    """
    key = (secret, scope, redirect)
    flow = FLOWS.get(key, None)
    if flow is None:
        msg = MISSING_CLIENT_MSG % secret
        if not os.path.exists(secret):
            raise AuthenticationConfigError(msg)
        flow = oauth.flow_from_clientsecrets(secret, scope,
                                             redirect_uri=redirect,
                                             message=msg)
        FLOWS[key] = flow
    return flow